IJSRST1845437 | Received : 15 April 2018 | Accepted : 30 April 2018 | March-April-2018 [ (4) 7 : 265-271] © 2018 IJSRST | Volume 4 | Issue 7 | Print ISSN: 2395-6011 | Online ISSN: 2395-602X Themed Section: Science and Technology 265 Comparative Study of Rotational Tool EDM and Stationary Tool EDM - A Review Malak Soni 1 , Ronak J Rana 2 1 Merchant Engineering College, Mechanical Engineering Department, Merchant Education Campus, Mehsana, Visnagar Highway, Basna, Mehsana, Gujarat, India 2 Mechanical Engineering Department, R H Patel Institute of Technology, Kheda, Gujarat, India ABSTRACT Electrical Discharge Machining (EDM) is a non-conventional machining process in which the machining takes place through spark erosion between tool electrode and workpiece. EDM is used for hard materials which are generally difficult to machine using conventional machining method. Research has been done on EDM to improve its performance measures like Material removal rate (MRR), tool wear rate (TWR), surface roughness (SR) and dimensional accuracy. Various researchers have performed the work on various types of EDMs like Die Sinking EDM, Dry EDM, Powder Mixed EDM (PMEDM) and Wire EDM (WEDM) etc. In this paper objective is to review the research done on EDM assisted with rotary tool. In this paper there is also a depiction about the machining and non-machining parameters used during the particular research work. Present paper reviews the research work done on rotary and orbital EDM to improve its performance measures like MRR, TWR and SR. Keywords : Electrical Discharge Machine, Rotary tool EDM, Material Removal Rate, Tool Wear Rate I. INTRODUCTION Electric Discharge Machining (EDM) process started around 1770 when an English Scientist Joseph Priestly found the erosive impact of the electric discharges. In 1930, first effort were made to machine metals and diamonds using electric discharges, and the process was known by the name as “arc machining or spark machining” process. Then after, in 1943, two Russian Scientists, B.R. Lazarenko and N.I. Lazarenko at the Moscow University did innovative work on EDM. The destructive effect of an electric discharge was channelized and a controlled process for the machining of materials was developed. The relaxation-capacitance (RC) circuit was introduced in 1950s, which provided the first consistent dependable control of pulse time and a simple servo system control circuit to automatically sense the required inter-electrode gap between the tool and the work- piece. In 1980s, the introduction of Computer Numerical Control (CNC) in EDM, brought tremendous advancement in improvising the efficiency of the machining process. Modern EDM machines are so stable these days that these can be operated round the clock under adaptive control system monitoring (Kumara et al., 2009). Electrical discharge machining is versatile among all electrical machining methods.EDM is most precise production procedure for creating complicated or elementary shapes, geometrics components and assemblies. It is basically a non-conventional material removal process. Its exclusive characteristic of using